OK, thanks, that was actually helpful.
To clear that up, I assumed marketing BS because I found similar measurements for another phone hyped as being "for audiophiles" - the Vivo X5 Max - and because I'm the kind who trusts measurements and numbers over subjective opinions no matter how many there are of the latter (even in a forum like this I can't know what percentage of the users actually know what they're talking about - it's still the Internet, or humanity if you will).
On one hand, that means they must've made the same mistake when assessing the Vivo and possibly also some of the hyped models from Meizu (MX4?), but on the other it also has to mean that support for the high-end DACs in these phones is still pretty flimsy, considering you have to jump through so many hoops just to get them activated. What remains strange about this is that I'm supposed to believe people who know how to make SNR and crosstalk measurements would make such a stupid mistake as to not make sure they've activated the right DAC... orrr... if the measurements are actually just quoted from the manufacturers' documentation, that these manufacturers are putting out awesome devices without publishing (and emphasizing!) their awesome specs.
Anyway, it looks like I do have to look more deeply into this. There are definitely strange things going on with the information being published by the manufacturers and GSM Arena alike.